|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||airport : 5go.airport|
|Altitude||msl bound lower : 780|
msl bound upper : 1100
|Operator||general aviation : personal|
|Make Model Name||PA-24 Comanche|
|Operating Under FAR Part||Part 91|
|Flight Phase||cruise : level|
ground : preflight
|Function||flight crew : single pilot|
|Qualification||pilot : commercial|
pilot : instrument
|Experience||flight time last 90 days : 13|
flight time total : 1550
flight time type : 950
|Anomaly||aircraft equipment problem : critical|
altitude deviation : undershoot
non adherence : published procedure
non adherence : far
other anomaly other
|Independent Detector||other flight crewa|
|Resolutory Action||flight crew : overcame equipment problem|
flight crew : became reoriented
Flight Crew Human Performance
|Primary Problem||Flight Crew Human Performance|
The altimeter setting had changed approximately 1 inch since the last time I flew the airplane. The airport that I fly from is uncontrolled and no current altimeter setting is available. I did my preflight and taxied to the end of the takeoff runway, did a run-up, checked engine and flight instruments, and set altimeter to field elevation 780 ft (I thought). I should say, set the large pointer to 80 ft without regard for the small pointer, which was at '1,' which made my altimeter read 1780 ft. I took off and thought 'how did I get to 2500 ft so fast?' as I was trying to figure out what was going on, I had to descend to below 2100 ft to go below class C airspace. Ground elevation at this point was about 500-600 ft MSL. So I was flying at about 1100 ft MSL, not exactly sure. At this point I could see that I was a lot lower than I thought, tuned in ATIS from large airport and got correct altimeter setting. It was set about .8 of an inch off. I believe that I was over sparsely populated area so, therefore, I don't think I violated any FARS. However, I filed this report because it was something that could have presented a very dangerous situation and maybe someone else can learn to always check the altimeter completely when setting it. I know I will.
Original NASA ASRS Text
Title: PLT OF PA28 SETS ALTIMETER KOLLSMAN INCORRECTLY AND FLIES INITIAL STAGES OF FLT 800 FT LOWER THAN INDICATED.
Narrative: THE ALTIMETER SETTING HAD CHANGED APPROX 1 INCH SINCE THE LAST TIME I FLEW THE AIRPLANE. THE ARPT THAT I FLY FROM IS UNCTLED AND NO CURRENT ALTIMETER SETTING IS AVAILABLE. I DID MY PREFLT AND TAXIED TO THE END OF THE TKOF RWY, DID A RUN-UP, CHKED ENG AND FLT INSTS, AND SET ALTIMETER TO FIELD ELEVATION 780 FT (I THOUGHT). I SHOULD SAY, SET THE LARGE POINTER TO 80 FT WITHOUT REGARD FOR THE SMALL POINTER, WHICH WAS AT '1,' WHICH MADE MY ALTIMETER READ 1780 FT. I TOOK OFF AND THOUGHT 'HOW DID I GET TO 2500 FT SO FAST?' AS I WAS TRYING TO FIGURE OUT WHAT WAS GOING ON, I HAD TO DSND TO BELOW 2100 FT TO GO BELOW CLASS C AIRSPACE. GND ELEVATION AT THIS POINT WAS ABOUT 500-600 FT MSL. SO I WAS FLYING AT ABOUT 1100 FT MSL, NOT EXACTLY SURE. AT THIS POINT I COULD SEE THAT I WAS A LOT LOWER THAN I THOUGHT, TUNED IN ATIS FROM LARGE ARPT AND GOT CORRECT ALTIMETER SETTING. IT WAS SET ABOUT .8 OF AN INCH OFF. I BELIEVE THAT I WAS OVER SPARSELY POPULATED AREA SO, THEREFORE, I DON'T THINK I VIOLATED ANY FARS. HOWEVER, I FILED THIS RPT BECAUSE IT WAS SOMETHING THAT COULD HAVE PRESENTED A VERY DANGEROUS SIT AND MAYBE SOMEONE ELSE CAN LEARN TO ALWAYS CHK THE ALTIMETER COMPLETELY WHEN SETTING IT. I KNOW I WILL.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.